Source Code Cross Referenced for SimpleSDClientPlugin.java in  » Science » Cougaar12_4 » org » cougaar » servicediscovery » plugin » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.servicediscovery.plugin 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * <copyright>
003:         * 
004:         *  Copyright 2004 BBNT Solutions, LLC
005:         *  under sponsorship of the Defense Advanced Research Projects
006:         *  Agency (DARPA).
007:         * 
008:         *  You can redistribute this software and/or modify it under the
009:         *  terms of the Cougaar Open Source License as published on the
010:         *  Cougaar Open Source Website (www.cougaar.org).
011:         * 
012:         *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
013:         *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
014:         *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
015:         *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
016:         *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
017:         *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
018:         *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
019:         *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
020:         *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
021:         *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
022:         *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
023:         * 
024:         * </copyright>
025:         */
026:        package org.cougaar.servicediscovery.plugin;
027:
028:        import org.cougaar.core.blackboard.IncrementalSubscription;
029:        import org.cougaar.core.mts.MessageAddress;
030:        import org.cougaar.core.plugin.ComponentPlugin;
031:        import org.cougaar.core.service.DomainService;
032:        import org.cougaar.core.service.LoggingService;
033:        import org.cougaar.planning.ldm.PlanningDomain;
034:        import org.cougaar.planning.ldm.PlanningFactory;
035:        import org.cougaar.planning.ldm.asset.Entity;
036:        import org.cougaar.planning.ldm.plan.AllocationResult;
037:        import org.cougaar.planning.ldm.plan.Disposition;
038:        import org.cougaar.planning.ldm.plan.PrepositionalPhrase;
039:        import org.cougaar.planning.ldm.plan.Role;
040:        import org.cougaar.planning.ldm.plan.Task;
041:        import org.cougaar.planning.plugin.util.PluginHelper;
042:        import org.cougaar.servicediscovery.Constants;
043:        import org.cougaar.servicediscovery.SDDomain;
044:        import org.cougaar.servicediscovery.SDFactory;
045:        import org.cougaar.servicediscovery.description.MMRoleQuery;
046:        import org.cougaar.servicediscovery.description.ScoredServiceDescription;
047:        import org.cougaar.servicediscovery.description.ServiceClassification;
048:        import org.cougaar.servicediscovery.description.ServiceDescription;
049:        import org.cougaar.servicediscovery.description.ServiceInfoScorer;
050:        import org.cougaar.servicediscovery.description.ServiceRequest;
051:        import org.cougaar.servicediscovery.transaction.MMQueryRequest;
052:        import org.cougaar.servicediscovery.transaction.ServiceContractRelay;
053:        import org.cougaar.servicediscovery.util.RoleScorer;
054:        import org.cougaar.servicediscovery.util.UDDIConstants;
055:        import org.cougaar.util.TimeSpan;
056:        import org.cougaar.util.UnaryPredicate;
057:
058:        import java.util.Collection;
059:        import java.util.Iterator;
060:
061:        /**
062:         * Simple ServiceDiscovery ClientPlugin, responsible for initiating queries for services, 
063:         * taking the resulting service pointer, and sending a Relay to the Provider requesting service. 
064:         *<p>
065:         * Service Discovery is initiated by receiving a Find Providers task, and looking for the single Role
066:         * indicated on the AS Prepositional Phrase.
067:         * Sends a Disposition on the FindProviders Task when it gets a Relationship
068:         * with a provider for the service.
069:         *<p>
070:         * This Plugin is written to be extended (or copied). See the pizza module for an example of doing this.
071:         *<p>
072:         * Limitations: not quiescent aware, doesn't handle time-phased relationships, 
073:         * not guaranteed to work with persistence and restarts, and assumes that providers
074:         * will not revoke relationships or otherwise change their mind.
075:         */
076:        public class SimpleSDClientPlugin extends ComponentPlugin {
077:            /** Our queries to the Matchmaker */
078:            private IncrementalSubscription myMMRequestSubscription;
079:            /** Our requests to Providers */
080:            private IncrementalSubscription myServiceContractRelaySubscription;
081:            /** FindProviders Tasks asking us to do work */
082:            private IncrementalSubscription myFindProvidersTaskSubscription;
083:
084:            protected LoggingService myLoggingService;
085:            private DomainService myDomainService;
086:
087:            // Used to create ServiceContractRelay, etc
088:            private SDFactory mySDFactory;
089:
090:            // Used to create AllocationResults, Dispositions, etc
091:            private PlanningFactory myPlanningFactory;
092:
093:            // A pointer to the local (self) entity
094:            private Entity mySelfEntity;
095:
096:            /**
097:             * Used by the binding utility through reflection to set my DomainService
098:             */
099:            public void setDomainService(DomainService domainService) {
100:                myDomainService = domainService;
101:            }
102:
103:            /**
104:             * Get the DomainService set by reflection, for getting pointers to Factories.
105:             */
106:            protected DomainService getDomainService() {
107:                return myDomainService;
108:            }
109:
110:            /**
111:             * Get the PlanningFactory
112:             */
113:            protected PlanningFactory getPlanningFactory() {
114:                return myPlanningFactory;
115:            }
116:
117:            /**
118:             * Get the SDFactory. Factory for service discovery domain
119:             */
120:            protected SDFactory getSDFactory() {
121:                return mySDFactory;
122:            }
123:
124:            /**
125:             * Load other services, particularly those not essential to operations. 
126:             * In this case, use the DomainService to get Factories and release it. 
127:             * Also get the Logging Service.
128:             */
129:            public void load() {
130:                super .load();
131:
132:                myLoggingService = (LoggingService) getServiceBroker()
133:                        .getService(this , LoggingService.class, null);
134:                if (myLoggingService == null)
135:                    myLoggingService = LoggingService.NULL;
136:
137:                mySDFactory = (SDFactory) getDomainService().getFactory(
138:                        SDDomain.SD_NAME);
139:                myPlanningFactory = (PlanningFactory) getDomainService()
140:                        .getFactory(PlanningDomain.PLANNING_NAME);
141:            }
142:
143:            /** Release any services retrieved during load() -- in this case, the LoggingService and DomainService*/
144:            public void unload() {
145:                if (myLoggingService != LoggingService.NULL) {
146:                    getServiceBroker().releaseService(this ,
147:                            LoggingService.class, myLoggingService);
148:                    myLoggingService = LoggingService.NULL;
149:                }
150:
151:                if (myDomainService != null) {
152:                    getServiceBroker().releaseService(this ,
153:                            DomainService.class, myDomainService);
154:                    setDomainService(null);
155:                }
156:
157:                myPlanningFactory = null;
158:                mySDFactory = null;
159:                super .unload();
160:            }
161:
162:            /**
163:             * Subscribe to MMRequests (requests to the Matchmaker),
164:             * ServiceContractRelays (where we'll get responses from the Providers),
165:             * and FindProviders Tasks (requests to us to do ServiceDiscovery).
166:             */
167:            protected void setupSubscriptions() {
168:                myMMRequestSubscription = (IncrementalSubscription) getBlackboardService()
169:                        .subscribe(MYMMREQUESTPREDICATE);
170:                myServiceContractRelaySubscription = (IncrementalSubscription) getBlackboardService()
171:                        .subscribe(MYSERVICECONTRACTRELAYPREDICATE);
172:                myFindProvidersTaskSubscription = (IncrementalSubscription) getBlackboardService()
173:                        .subscribe(getFindProvidersPredicate());
174:            }
175:
176:            /**
177:             * Issue MMQueries for FindProviders Tasks, ServiceContractRelays for responses to MMQueries, 
178:             * and Dispositions on the FindProviders Tasks when those Relays are filled in with a Contract. 
179:             *<p>
180:             * For each new FindProviders Task, issue an MMQuery to the Matchmaker, looking for the 
181:             * specified Role.
182:             * If an MMQuery changes, issue a new ServiceContractRelay to the first named Provider
183:             * that was found. 
184:             * If a ServiceContractRelay changes, update the Disposition on the original FindProviders
185:             * Task if we've now found a Provider for the needed Service.
186:             */
187:            protected void execute() {
188:                // One if block below per subscription
189:
190:                // Look for new FindProviders Tasks -- requests for Services
191:                if (myFindProvidersTaskSubscription.hasChanged()) {
192:                    // If we've been asked to do more ServiceDiscovery
193:                    Collection adds = myFindProvidersTaskSubscription
194:                            .getAddedCollection();
195:
196:                    for (Iterator addIterator = adds.iterator(); addIterator
197:                            .hasNext();) {
198:                        // Grab the task
199:                        Task findProviderTask = (Task) addIterator.next();
200:                        // Get the requested role from the Task.
201:                        Role taskRole = getRole(findProviderTask);
202:
203:                        // Send the query for the given Role, because of the given Task.
204:                        queryServices(taskRole, findProviderTask);
205:                    }
206:
207:                    // We don't handle removes or changes to the FindProviders...
208:                    if (myLoggingService.isDebugEnabled()) {
209:                        Collection changes = myFindProvidersTaskSubscription
210:                                .getChangedCollection();
211:                        Collection removes = myFindProvidersTaskSubscription
212:                                .getRemovedCollection();
213:                        if (!changes.isEmpty() || !removes.isEmpty()) {
214:                            myLoggingService
215:                                    .debug("execute: ignoring changed/deleted FindProvider tasks - "
216:                                            + " changes = "
217:                                            + changes
218:                                            + ", removes = " + removes);
219:                        }
220:                    }
221:                } // end of block to handle FindProviders Tasks
222:
223:                // Look for responses on our queries to the Matchmaker for YP lookups
224:                if (myMMRequestSubscription.hasChanged()) {
225:                    for (Iterator iterator = myMMRequestSubscription
226:                            .getChangedCollection().iterator(); iterator
227:                            .hasNext();) {
228:                        MMQueryRequest mmRequest = (MMQueryRequest) iterator
229:                                .next();
230:
231:                        if (myLoggingService.isDebugEnabled()) {
232:                            myLoggingService
233:                                    .debug("execute: MMQueryRequest has changed."
234:                                            + mmRequest);
235:                        }
236:
237:                        // Get the request
238:                        Collection services = mmRequest.getResult();
239:                        if (services != null) {
240:                            // Debugging: print all results
241:                            if (myLoggingService.isDebugEnabled()) {
242:
243:                                myLoggingService.debug("Results for query "
244:                                        + mmRequest.getQuery().toString());
245:                                for (Iterator serviceIterator = services
246:                                        .iterator(); serviceIterator.hasNext();) {
247:                                    ScoredServiceDescription serviceDescription = (ScoredServiceDescription) serviceIterator
248:                                            .next();
249:                                    myLoggingService.debug("Score "
250:                                            + serviceDescription.getScore());
251:                                    myLoggingService.debug("Provider name "
252:                                            + serviceDescription
253:                                                    .getProviderName());
254:                                    myLoggingService.debug("*********");
255:                                }
256:                            } /// End of debugging....
257:
258:                            // For each service
259:                            for (Iterator serviceIterator = services.iterator(); serviceIterator
260:                                    .hasNext();) {
261:                                ScoredServiceDescription serviceDescription = (ScoredServiceDescription) serviceIterator
262:                                        .next();
263:
264:                                // Debugging...
265:                                if (myLoggingService.isDebugEnabled()) {
266:                                    myLoggingService
267:                                            .debug("execute: - provider: "
268:                                                    + serviceDescription
269:                                                            .getProviderName()
270:                                                    + " score: "
271:                                                    + serviceDescription
272:                                                            .getScore());
273:                                } // end debug
274:
275:                                // Request a Service Contract for it
276:                                requestServiceContract(serviceDescription);
277:
278:                                // only want one contract, no matter how many are in loop
279:                                if (myLoggingService.isDebugEnabled()
280:                                        && serviceIterator.hasNext())
281:                                    myLoggingService
282:                                            .debug("Had more than one service: "
283:                                                    + services.size());
284:                                break;
285:                            }
286:
287:                            // Done with the query so could clean up, but leave it for the MatchmakeryQueryServlet
288:                            //getBlackboardService().publishRemove(mmRequest);
289:                        }
290:                    }
291:                } // end of block to handle response from the Matchmaker
292:
293:                // Look for responses on our queries to potential providers
294:                if (myServiceContractRelaySubscription.hasChanged()) {
295:                    Collection changedRelays = myServiceContractRelaySubscription
296:                            .getChangedCollection();
297:
298:                    // Update disposition on FindProviders task
299:                    if (changedRelays.size() > 0) {
300:                        if (myLoggingService.isDebugEnabled()) {
301:                            myLoggingService.debug("changedRelays.size = "
302:                                    + changedRelays.size()
303:                                    + ", updateFindProvidersTaskDispositions");
304:                        }
305:                        updateFindProvidersTaskDispositions(changedRelays);
306:                    }
307:                } // end of block to handle changed ServiceContractRelays
308:            } // end of execute
309:
310:            /////////
311:            // Methods to get the query to the Matchmaker...
312:
313:            /**
314:             * Return the Role (indirect object) on the Constants.Prepositions.AS Prep Phrase in the given
315:             * FindProviders Task, if any -- this is the Provider Role we will look for.
316:             *
317:             * @param findProvidersTask Task which should contain an AS Prepositional Phrase
318:             * @return Role on AS Phrase, indicate Role desired from ServiceDiscovery -- may be null
319:             */
320:            protected Role getRole(Task findProvidersTask) {
321:                PrepositionalPhrase asPhrase = findProvidersTask
322:                        .getPrepositionalPhrase(org.cougaar.planning.Constants.Preposition.AS);
323:
324:                if (asPhrase == null) {
325:                    return null;
326:                } else {
327:                    return (Role) asPhrase.getIndirectObject();
328:                }
329:            }
330:
331:            /**
332:             * Send an {@link MMQueryRequest} to the Matchmaker, requesting a provider
333:             * with the given {@link Role}, satisfying the given Task. 
334:             *<p>
335:             * Extenders of this plugin might choose to over-ride this method, though it usually will
336:             * not be necessary.
337:             *
338:             * @param role The {@link Role} to request
339:             * @param findProvidersTask The Task whose request this will satisfy
340:             */
341:            protected void queryServices(Role role, Task findProvidersTask) {
342:                MMQueryRequest mmRequest;
343:
344:                if (myLoggingService.isInfoEnabled())
345:                    myLoggingService
346:                            .info("queryServices asking MatchMaker for: "
347:                                    + role + " because of task "
348:                                    + findProvidersTask);
349:
350:                // Create a scoring function for the Matchmaker to use to weigh providers
351:                ServiceInfoScorer sis = getServiceInfoScorer(role,
352:                        findProvidersTask);
353:
354:                // Now create the set of YP / SD structures, publishing the request on the BlackBoard,
355:                // for the MatchmakerPlugin to pick up
356:                MMRoleQuery roleQuery = new MMRoleQuery(role, sis);
357:                mmRequest = getSDFactory().newMMQueryRequest(roleQuery);
358:                getBlackboardService().publishAdd(mmRequest);
359:            }// end of queryServices
360:
361:            /**
362:             * Create a scoring function to weigh different services registered in the YP, for use
363:             * by the Matchmaker. 
364:             * In this case, create a function that requires the given (Commercial) role.
365:             *<p>
366:             * Extenders of this plugin may over-ride this method to use a different function.
367:             *
368:             * @param role the Role to look for
369:             * @param fpTask The FindProviders task this will satisfy
370:             * @return the scoring function to hand the Matchmaker
371:             */
372:            protected ServiceInfoScorer getServiceInfoScorer(Role role,
373:                    Task fpTask) {
374:                // Create a Service Scorer that looks for a provider with the given role,
375:                return new RoleScorer(role);
376:            }
377:
378:            ///////////
379:            // Support methods for tasking Matchmaker response and requesting the service from the Provider
380:
381:            /**
382:             * Create and publish a relay with a service request for the specified Role, to the Provider 
383:             * specified in the serviceDescription.
384:             *
385:             * @param serviceDescription the Matchmaker tells us about the possible service provider in this Service Description
386:             */
387:            protected void requestServiceContract(
388:                    ServiceDescription serviceDescription) {
389:                //  Pull the Role off the Commercial Service Scheme in this serviceDescription
390:                Role role = getRole(serviceDescription);
391:                if (role == null) {
392:                    myLoggingService
393:                            .error("Error requesting service contract: a null Role in serviceDescription: "
394:                                    + serviceDescription);
395:                } else {
396:                    // Create a request good for all time
397:                    TimeSpan timeSpan = TimeSpan.FOREVER;
398:                    String providerName = serviceDescription.getProviderName();
399:
400:                    // Create a ServiceRequest from the self Entity, for the given Role,
401:                    // for the specified time period (forever)
402:                    ServiceRequest request = getSDFactory().newServiceRequest(
403:                            getLocalEntity(), role,
404:                            getSDFactory().createTimeSpanPreferences(timeSpan));
405:
406:                    // Send that ServiceRequest in a Relay to the given Provider
407:                    ServiceContractRelay relay = getSDFactory()
408:                            .newServiceContractRelay(
409:                                    MessageAddress
410:                                            .getMessageAddress(providerName),
411:                                    request);
412:                    getBlackboardService().publishAdd(relay);
413:                }
414:            } // end of requestServiceContract
415:
416:            /**
417:             * Retrieve the Role that the Provider is offering out of the ServiceDescription. 
418:             * Note that this assumes the role is under the CommercialServiceScheme, using the 
419:             * Domain's Constants file. Extenders will over-ride this method.
420:             *
421:             * @param serviceDescription The Description of the Service as advertised in the YP.
422:             * @return the Role advertised by the Provider, or null if none found.
423:             */
424:            protected Role getRole(ServiceDescription serviceDescription) {
425:                // A serviceDescription may have multiple Classifications
426:                for (Iterator iterator = serviceDescription
427:                        .getServiceClassifications().iterator(); iterator
428:                        .hasNext();) {
429:                    ServiceClassification serviceClassification = (ServiceClassification) iterator
430:                            .next();
431:                    // We have placed the Roles providers are registering in the CommercialServiceScheme
432:                    if (serviceClassification.getClassificationSchemeName()
433:                            .equals(UDDIConstants.COMMERCIAL_SERVICE_SCHEME)) {
434:                        Role role = Role.getRole(serviceClassification
435:                                .getClassificationName());
436:                        return role;
437:                    }
438:                }
439:                return null;
440:            }
441:
442:            /**
443:             * Get the local (self) Entity - from a local cache, or by querying the Blackboard.
444:             * @return the local (self) Entity
445:             */
446:            protected Entity getLocalEntity() {
447:                if (mySelfEntity == null) {
448:                    Collection entities = getBlackboardService().query(
449:                            new UnaryPredicate() {
450:                                public boolean execute(Object o) {
451:                                    if (o instanceof  Entity) {
452:                                        return ((Entity) o).isLocal();
453:                                    }
454:                                    return false;
455:                                }
456:                            });
457:
458:                    if (!entities.isEmpty()) {
459:                        mySelfEntity = (Entity) entities.iterator().next();
460:                    }
461:                }
462:                return mySelfEntity;
463:            }
464:
465:            //////////
466:            // Methods for responding to the ServiceDiscovery requester when the ServiceContract is fulfilled
467:
468:            /**
469:             * For each ServiceContractRelay that changes and has a ServiceContract, find the
470:             * un-disposed FindProviders Task that requested a Provider with the given Role, and
471:             * dispose it as succesful.
472:             *<p>
473:             * Assumes there will be one un-disposed FindProviders Task per Role.
474:             */
475:            protected void updateFindProvidersTaskDispositions(
476:                    Collection changedServiceContractRelays) {
477:                if (myFindProvidersTaskSubscription.isEmpty()) {
478:                    // Nothing to update
479:                    return;
480:                }
481:
482:                // For each answered Relay
483:                for (Iterator relayIterator = changedServiceContractRelays
484:                        .iterator(); relayIterator.hasNext();) {
485:                    ServiceContractRelay relay = (ServiceContractRelay) relayIterator
486:                            .next();
487:
488:                    // If it includes a Contract
489:                    if (relay.getServiceContract() != null) {
490:                        Role relayRole = relay.getServiceContract()
491:                                .getServiceRole();
492:
493:                        // Look through my FindProviders Tasks
494:                        for (Iterator taskIterator = myFindProvidersTaskSubscription
495:                                .iterator(); taskIterator.hasNext();) {
496:                            Task findProvidersTask = (Task) taskIterator.next();
497:
498:                            Disposition disposition = (Disposition) findProvidersTask
499:                                    .getPlanElement();
500:
501:                            // I'm looking for an incomplete one
502:                            if (disposition == null) {
503:                                // Get the Role that this was looking for
504:                                Role taskRole = getRole(findProvidersTask);
505:
506:                                // Assuming only 1 open (un-disposed) task per Role.
507:                                if (taskRole.equals(relayRole)) {
508:                                    // So - they asked for a Role for which we now have a Service Contract.
509:                                    // Create a Disposition for the Task, with an EstimatedResult saying success
510:
511:                                    // The estAR is for the findProvidersTask, created by the planningFactory,
512:                                    // with a confidence of 1.0, success=true
513:                                    AllocationResult estResult = PluginHelper
514:                                            .createEstimatedAllocationResult(
515:                                                    findProvidersTask,
516:                                                    getPlanningFactory(), 1.0,
517:                                                    true);
518:                                    // The disposition should be the same Plan as the Task, for the findProvidersTask,
519:                                    // and include the new success estimatedResult
520:                                    disposition = getPlanningFactory()
521:                                            .createDisposition(
522:                                                    findProvidersTask.getPlan(),
523:                                                    findProvidersTask,
524:                                                    estResult);
525:
526:                                    getBlackboardService().publishAdd(
527:                                            disposition);
528:                                }
529:                            }
530:                        } // end of loop over FindProviders tasks
531:                    }
532:                } // end of loop over changed ServiceContractRelays
533:            } // end of updateFindProvidersTaskDispositions
534:
535:            ////////////////
536:            // Now the Unary Predicates for use with subscriptions.
537:            // Static Final cause we only need the one, unchanging instance.
538:            // Names in all caps since they're constants.
539:
540:            private static final UnaryPredicate MYSERVICECONTRACTRELAYPREDICATE = new UnaryPredicate() {
541:                public boolean execute(Object o) {
542:                    return (o instanceof  ServiceContractRelay);
543:                }
544:            };
545:
546:            private static final UnaryPredicate MYMMREQUESTPREDICATE = new UnaryPredicate() {
547:                public boolean execute(Object o) {
548:                    return (o instanceof  MMQueryRequest);
549:                }
550:            };
551:
552:            /**
553:             * Predicate to get the FindProviders Tasks. In the off-chance that your verb is 
554:             * slightly different, you can over-ride this method to point to your
555:             * domain-specific Verb Constant.
556:             *<b>
557:             * Note that it is not a constant, just so it can be over-ridden.
558:             */
559:            protected UnaryPredicate getFindProvidersPredicate() {
560:                return new UnaryPredicate() {
561:                    public boolean execute(Object o) {
562:                        if (o instanceof  Task) {
563:                            return ((Task) o).getVerb().equals(
564:                                    Constants.Verbs.FindProviders);
565:                        } else {
566:                            return false;
567:                        }
568:                    }
569:                };
570:            }
571:        }
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